Proportional reactive power sharing algorithm in Islanded AC microgrid

A microgrid (MG) is a local energy system consisting a number of energy sources (e.g. wind turbine or solar panels), energy storage units and loads that operate connected to the main electrical grid or autonomously. MGs require complex management and advanced control. One of the most important parts in microgrid structure are power electronic converters (PEC). They provide correct energy conversion from every Renewable Energy Sources (RES) and common control structure for whole system. In islanded microgrid a Classical Droop Control is usually implemented, which allows for the correct operation of parallel voltage source converters (VSC). However, additional complex power management algorithm is required, which balances system and improves reliability. The novel reactive power sharing algorithm is described in this paper, which takes into account the converter parameters as apparent power limit and maximum active power. The developed solution is verified in experimental research and compared with other known reactive power control methods.